thats partly the reason why there havn't been very many breakthroughs recently, most of the major diseases (heart disease, cancer, arthritis) are so complicated to sort out, as most have several vectors of infection (for lack of the appropriate word).
but, i think that the pharmacutical companies need a kick up the rear. yes a cure for cancer would make trillions, but in there here and now, it's easier and cheaper to concentrate on finding new drugs for existing and curable diseases.
unfortunatly, it all comes down to economics, not whats good for the populance.
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